Fiber optic splitter module

ABSTRACT

A telecommunications assembly includes a chassis and a plurality of fiber optic splitter modules mounted within the chassis. Each splitter module includes at least one fiber optic connector. Within an interior of the chassis are positioned at least one fiber optic adapter. Inserting the splitter module through a front opening of the chassis at a mounting location positions the connector of the splitter module for insertion into and mating with the adapter of the chassis. The adapters mounted within the interior of the chassis are integrally formed as part of a removable adapter assembly. A method of mounting a fiber optic splitter module within a telecommunications chassis is also disclosed.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 12/557,937,filed Sep. 11, 2009, now U.S. Pat. No. 7,853,112, which is acontinuation of application Ser. No. 12/229,511, filed Aug. 22, 2008,now U.S. Pat. No. 7,606,459, issued Oct. 20, 2009, which is acontinuation of application Ser. No. 11/354,297, filed Feb. 13, 2006,now U.S. Pat. No. 7,418,181, issued Aug. 26, 2008, which applicationsare incorporated herein by reference in their entirety.

FIELD

The present invention generally relates to fiber optictelecommunications equipment. More specifically, the present inventionrelates to fiber optic modules and chassis for holding fiber opticmodules.

BACKGROUND

In fiber optic telecommunications systems, it is common for opticalfibers of transmission cables to be split into multiple strands, eitherby optical splitting of a signal carried by a single stranded cable orby fanning out the individual fibers of a multi-strand cable. Further,when such systems are installed, it is known to provide excess capacityin the installations to support future growth and utilization of thefibers. Often in these installations, modules including splitters orfanouts are used to provide the connection between transmission fibersand customer fibers. To reduce the cost and complexity of the initialinstallation and still provide options for future expansion, a modulemounting chassis capable of mounting multiple modules may be used insuch an installation.

While the chassis may accept several modules, the initial installationmay only include fewer modules mounted in the chassis, or enough toserve current needs. These chassis may be configured with limited accessto one or more sides, or may be mounted in cramped locations. Inaddition, some of these chassis may be pre-configured with the maximumcapacity of transmission cables to accommodate and link to modules whichmay be installed in the future. Since it is desirable to have access tocomponents within the chassis for cleaning during the installation of anew module, some provision or feature of the chassis will desirablypermit a user to access and clean the connectors of thesepre-connectorized and pre-installed transmission cables.

It is also desirable for the chassis to be configured to ensure thatmodules are installed correctly and aligned with other components withinthe chassis to mate with the pre-connectorized and pre-installedtransmission cables.

SUMMARY

The present invention relates to a telecommunications assembly includinga chassis and a plurality of modules mounted within the chassis. Themodules include one or more fiber optic connectors. Within an interiorof the chassis at each mounting location are positioned correspondingfiber optic adapters. Inserting the module through a front opening ofthe chassis at a mounting location positions the one or more connectorsof the module for insertion into and mating with the adapters of thechassis. The adapters within the interior of the chassis are integrallyformed within a removable adapter assembly.

The present invention further relates to a method of mounting atelecommunications module within a chassis.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of the description, illustrate several aspects of the invention andtogether with the detailed description, serve to explain the principlesof the invention. A brief description of the drawings is as follows:

FIG. 1 is a rear perspective view of a telecommunications assembly witha plurality of fiber optic splitter modules installed within a chassis,with one of the adapter assemblies exploded out of thetelecommunications assembly;

FIG. 2 is a top view of the telecommunications assembly of FIG. 1;

FIG. 3 is a front view of the telecommunications assembly of FIG. 1;

FIG. 4 is a rear view of the telecommunications assembly of FIG. 1;

FIG. 5 is a left side view of the telecommunications assembly of FIG. 1;

FIG. 6 is a right side view of the telecommunications assembly of FIG.1;

FIG. 7 is a close-up view of the telecommunications assembly of FIG. 1showing the adapter assembly exploded out of the telecommunicationsassembly;

FIG. 8 is a front perspective view of one of the adapter assemblies ofFIG. 1;

FIG. 9 is a rear perspective view of the adapter assembly of FIG. 8;

FIG. 10 is a right side view of the adapter assembly of FIG. 8;

FIG. 11 is a left side view of the adapter assembly of FIG. 8;

FIG. 12 is a front view of the adapter assembly of FIG. 8;

FIG. 13 is a rear view of the adapter assembly of FIG. 8;

FIG. 14 is a top view of the adapter assembly of FIG. 8;

FIG. 15 is a bottom view of the adapter assembly of FIG. 8;

FIG. 16 is a right side view of one of the fiber optic splitter modulesof FIG. 1, shown with an adapter assembly mounted thereon;

FIG. 17 is a left side view of the fiber optic splitter module andadapter assembly of FIG. 16;

FIG. 18 is a front view of the fiber optic splitter module and adapterassembly of FIG. 16;

FIG. 19 is a rear view of the fiber optic splitter module and adapterassembly of FIG. 16;

FIG. 20 is a front perspective view of the fiber optic splitter moduleof FIG. 16, shown in isolation without an adapter assembly mountedthereon;

FIG. 21 is a rear perspective view of the fiber optic splitter module ofFIG. 20;

FIG. 22 is an exploded view of the fiber optic splitter module of FIG.16, shown with the adapter assembly exploded from the fiber opticsplitter module;

FIG. 23 is a left side view of the fiber optic splitter module of FIG.20;

FIG. 24 is a right side view of the fiber optic splitter module of FIG.20;

FIG. 25 is a front view of the fiber optic splitter module of FIG. 20;

FIG. 26 is a rear view of the fiber optic splitter module of FIG. 20;

FIG. 27 is a top view of the fiber optic splitter module of FIG. 20;

FIG. 28 is a bottom view of the fiber optic splitter module of FIG. 20;

FIG. 29 is a right side view of the fiber optic splitter module of FIG.20, shown without a cover exposing the interior features of the fiberoptic splitter module including routing of a fiber optic cable withinthe fiber optic splitter module;

FIG. 30 is a cross-sectional view taken along section line 30-30 of FIG.29;

FIG. 31 illustrates a fiber optic splitter module partially insertedwithin the chassis of FIG. 1, the chassis including an adapter assemblymounted thereon, the fiber optic splitter module shown in a positionprior to the connectors of the splitter module having contacted a shieldlocated within the chassis;

FIG. 32 illustrates the fiber optic splitter module of FIG. 31, shown ina position within the chassis with the connectors of the fiber opticsplitter module making initial contact with the shield located withinthe chassis;

FIG. 33 illustrates the fiber optic splitter module of FIG. 31, shown ina fully inserted position within the chassis;

FIG. 34 is a side cross-sectional view of the fiber optic splittermodule of FIG. 32 within the chassis, taken through the center of thefiber optic splitter module;

FIG. 35 is a side cross-sectional view of the fiber optic splittermodule of FIG. 33 within the chassis, taken through the center of thefiber optic splitter module;

FIG. 36 illustrates a front perspective view of the chassis of FIG. 1with a fiber optic splitter module mounted thereon, shown in combinationwith a dust cap/test tool exploded off the chassis, the dust cap/testtool being used as a test tool;

FIG. 37 illustrates a front perspective view of the chassis of FIG. 36,shown in combination with the dust cap/test tool exploded off thechassis, the dust cap/test tool being used as a dust cap;

FIG. 38 illustrates the dust cap/test tool of FIG. 36 shown incombination with an exploded view of the adapter assembly of FIG. 8;

FIG. 39 is a front perspective view of the dust cap/test tool of FIG. 36shown with the adapter assembly mounted thereon and shown with one ofthe testing connectors of the dust cap/test tool exploded off the dustcap/test tool;

FIG. 40 is a rear perspective view of the dust cap/test tool of FIG. 36,shown without the testing connectors of the dust cap/test tool;

FIG. 41 is a front perspective view of the dust cap/test tool of FIG.40;

FIG. 42 is a right side view of the dust cap/test tool of FIG. 40;

FIG. 43 is a left side view of the dust cap/test tool of FIG. 40;

FIG. 44 is a rear view of the dust cap/test tool of FIG. 40;

FIG. 45 is a top view of the dust cap/test tool of FIG. 40;

FIG. 46 is a bottom front perspective view of a grip extension accordingto the invention;

FIG. 47 is a bottom rear perspective view of the grip extension of FIG.46;

FIG. 48 is a bottom view of the grip extension of FIG. 46;

FIG. 49 is a top view of the grip extension of FIG. 46;

FIG. 50 is a right side view of the grip extension of FIG. 46;

FIG. 51 is a left side view of the grip extension of FIG. 46; and

FIG. 52 is a rear view of the grip extension of FIG. 46;

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary aspects of the presentinvention which are illustrated in the accompanying drawings. Whereverpossible, the same reference numbers will be used throughout thedrawings to refer to the same or similar parts.

FIGS. 1-7 illustrate a telecommunications assembly 10 that includes atelecommunications chassis 12 and a plurality of fiber optic splittermodules 14 adapted to be mounted within chassis 12. Fiber optic splittermodules 14 are configured to be slidably inserted within chassis 12 andbe optically coupled to adapter assemblies 16 mounted within chassis 12.Adapter assemblies 16 mounted within chassis 12 form connectionlocations between connectors terminated to an incoming fiber optic cableand connectors of splitter modules 14 as will be discussed in furtherdetail below.

Still referring to FIGS. 1-7, chassis 12 includes a top wall 18 and abottom wall 20 extending between a pair of opposing transversesidewalls, 22, 24. Chassis 12 includes an opening 26 through a rear side28 of chassis 12 and an opening 30 through a front side 32 of chassis12. Fiber optic splitter modules 14 are inserted into chassis 12 throughfront opening 30. Adapter assemblies 16 are inserted through and mountedadjacent rear opening 26 of chassis 12. Sidewalls 22, 24, each include acut-out 34 extending from front opening 30 toward rear side 28. Splittermodules 14 mounted within chassis 12 are visible through cut-out 34.Sidewalls 22, 24 of chassis 12 also define an inset portion 36 at rearside 28 of chassis 12 to facilitate access to adapter assemblies 16.

In FIG. 1, chassis 12 is shown with eight fiber optic splitter modules14 mounted thereon. It should be noted that in other embodiments, thechassis may be sized to hold a larger or a smaller number of splittermodules.

Still referring to FIGS. 1-7, chassis 12 includes a plurality ofmounting locations 38 for slidably receiving splitter modules 14. Eachmounting location 38 defines a slot 40 adjacent top wall 18 and a slot42 adjacent bottom wall 20 of chassis 12. Slots 42 adjacent bottom wall20 are visible in FIG. 1. Slots 40 adjacent top wall 18 are illustratedin FIGS. 36 and 37. Slots 40, 42 extend from front 32 of chassis 12 torear 28 of chassis 12. Slots 40, 42 are configured to receive mountingflanges 44, 46 of splitter modules 14 as shown in FIGS. 36 and 37 toalign modules 14 with other components within chassis 12 (e.g., adaptersof the adapter assemblies) to mate with pre-connectorized and/orpre-installed transmission cables.

Slots 40 defined underneath top wall 18 of chassis 12 are deeper thanslots 42 defined at bottom wall 20 of chassis 12. The depth of slots 40,42 are configured to accommodate the different sized flanges 44, 46 thatare defined at top and bottom walls of splitter modules 14. In thismanner, slots 40, 42 and mounting flanges 44, 46 of fiber optic splittermodules 14 provide a keying system to ensure that modules 14 areinserted into chassis 12 in the correct orientation.

Slots 40 underneath top wall 18 of chassis 12 are defined between aplurality of bulkheads 48 (please see FIGS. 36 and 37). Bulkheads 48extend from front 32 of chassis 12 to rear 28 of chassis 12. At frontend 32 of chassis 12, each bulkhead 48 defines a downwardly extendingfront lip 50 (FIG. 35) which interlocks with a resiliently deformablelatch 52 (e.g., cantilever arm) of splitter module 14 to hold splittermodule 14 in place within chassis 12, as will be discussed in furtherdetail below.

Referring to FIGS. 1 and 7, at rear end 28 of chassis 12, each bulkhead48 defines a rear face 54 with a fastener hole 56 for receiving afastener 58 (e.g., a thumbscrew) of an adapter assembly 16 for mountingadapter assembly 16 to chassis 12. In the embodiment shown, fastenerhole 56 is threaded to receive a screw-type fastener. It should be notedthat in other embodiments, other types of fastening structures may beused to mount adapter assembly 16 to rear 28 of chassis 12.

Adjacent rear end 28, each bulkhead 48 also includes a horizontal slot60 and a vertical slot 62 that complement the shape of adapter assembly16 to slidably receive adapter assembly 16.

FIGS. 8-15 illustrate adapter assembly 16 according to the invention.Adapter assemblies 16 form connection locations between the connectorsterminated to an incoming fiber optic cable and the connectors ofsplitter modules 14 mounted within chassis 12.

Referring to FIGS. 8-15, adapter assembly 16 includes two integratedadapters 64 formed as a part of a unitary housing 66. In otherembodiments, other number of adapters are also possible. Each adapter 64of adapter assembly 16 includes a front end 68 and a rear end 70. Frontend 68 of each adapter 64 receives a connector of fiber optic splittermodule 14 and rear end 70 receives a connector terminated to an incomingfiber optic cable.

Adapter assembly housing 66 includes a chassis-mounting slide 72extending from a top 74 of housing 66, which is received within chassis12 through rear end 28. Slide 72 defines a horizontal portion 76 and avertical portion 78. Horizontal portion 76 is configured to be slidablyreceived within horizontal slot 60 of bulkhead 48 and vertical portion78 is configured to be slidably received within vertical slot 62 ofbulkhead 48.

Chassis-mounting slide 72 includes a pair of flanges 80 for supporting afastener 58 for securing adapter assembly 16 to chassis 12. As discussedearlier, fastener 58 is positioned within an opening 56 defined by rearface 54 of bulkheads 48 located underneath top wall 18 of chassis 12.Fastener 58 is preferably a captive fastener. In the embodiment of theadapter assembly shown in the FIGS., fastener 58 is a thumbscrew. Inother embodiments, other types of fasteners may be used.

Fastener 58 is rotated to threadingly couple the adapter assembly 16 tothe bulkheads 48. Fastener 58 is also configured such that it is able toprovide adapter assembly 16 with a predetermined amount of horizontalfloat relative to the chassis 12 once mounted thereon. As illustrated inFIGS. 8-14, the fastener 58 of the adapter assembly 16 includes a flange81. The fastener 58 is able to move horizontally within the flanges 80relative to the adapter assembly housing 66. As shown in FIG. 35, oncemounted to the chassis 12, the adapter assembly housing 66 is able tofloat or move horizontally with respect to the fastener 58 betweenflange 81 and the rear face of the bulkhead 48. For example, in FIG. 35,adapter assembly 16 is shown to be able to move or float a distance of Atoward the rear end of chassis 12. In this manner, when a splittermodule 14 is slidably pulled out of chassis 12 during disengagement,adapter assembly 16 is able to horizontally float a distance A towardssplitter module 14 as the engaged connector 118 of splitter module 14pulls on adapter 64 of adapter assembly 16. In this manner, adapterassembly 16 is provided with a certain amount of horizontal float whenbeing engaged to and disengaged from splitter module 14.

As shown in an exploded view of adapter assembly 16 in FIG. 38, elementsof each adapter 64 are positioned through a side opening 82 into adapterrecesses 84 formed within the adapter assembly housing 66. The elementsfor each adapter 64 include a ferrule alignment sleeve 86 and a pair ofinner housing halves 88. These elements are placed within recesses 84 inmanner similar to that shown in commonly-owned U.S. Pat. No. 5,317,663,issued May 20, 1993, entitled ONE-PIECE SC ADAPTER, the disclosure ofwhich is incorporated herein by reference. A panel 90 closes opening 82and secures the elements within each adapter 64. Adapters 64 shown arefor SC style connectors, although other types, styles and formats ofadapters may be used within the scope of the present disclosure andconnectors to mate with these alternative adapters.

In FIGS. 16-19, adapter assembly 16 is shown mounted to a fiber opticsplitter module 14, outside of chassis 12.

FIGS. 20-30 illustrate one of the fiber optic splitter modules 14according to the invention. Referring to FIGS. 20-30, the fiber opticsplitter module 14 includes a splitter module housing 92. Splittermodule housing 92 includes a main housing portion 94 and a removablecover 96. Main housing portion 94 includes a first transverse sidewall98 extending between a top wall 100, a bottom wall 102, a rear wall 104,and a front wall 106. Removable cover 96 defines a second transversewall 108 of splitter module housing 92 and closes off the open side ofmodule main housing 94.

Cover 96 is mounted to main housing portion 94 by fasteners (not shown)through fastener mounts 110 defined on main housing portion 94. Cover 96extends beyond first transverse sidewall 98 to form a top mountingflange 44 and a bottom mounting flange 46 of splitter module 14.Referring to FIGS. 23, 25, and 26, as discussed previously, bottomflange 46 of splitter module housing 92 and the corresponding slot 42 onchassis 12 are smaller in size than top flange 44 and the correspondingtop slot 40 on chassis 12. Bottom slot 42 is sized so that, while bottomflange 46 may be received within slot 42, the larger top flange 44 willnot fit. This ensures that modules 14 are positioned within frontopening 30 in a particular desired orientation. Similar flanges aredescribed in commonly-owned U.S. Pat. No. 5,363,465, issued Nov. 8,1994, entitled FIBER OPTIC CONNECTOR MODULE, the disclosure of which isincorporated herein by reference. In this manner, fiber optic modules 14are oriented correctly to be coupled to adapter assemblies 16 mountedadjacent rear 28 of chassis 12 at each mounting location 38.

Rear wall 104 of main housing portion 94 includes a curved portion 112configured to provide bend radius protection to cables within interior114. Rear wall 104 of main housing 92 also includes an inset portion116. A pair of fiber optic connectors 118 positioned at inset portion116 protrude rearwardly from rear wall 104 for mating with fiber opticadapters 64 of adapter assemblies 16 mounted within chassis 12.

As shown in FIGS. 5 and 6, front wall 106 of module main housing 94 isangled with regard to front opening 30 of chassis 12, which may aid inthe direction of cables exiting module 14 toward a desired location. Inother embodiments, front walls 106 could be made generally parallel tofront 32 of chassis 12 within the scope of the present disclosure.

Each module 14 includes two cable exits 120 extending from front wall106 of module main housing 94. As shown in FIG. 22, cable exits 120 areslidably mounted to main housing 94 of module 14 and captured by cover96 of module 14 when cover 96 is mounted to main housing 94. Cable exits120 define a protruding rear lip 122 that is slidably inserted intoslots 124 defined around front apertures 126 for accommodating cableexits 120. Cover 96 also includes slits 128 that receive rear lips 122of the cable exits 120 to capture cable exits 120. Cable exits 120permit telecommunications cables within module 14 to be directed outsideof module 14. Cable exits 120 are preferably sized thin enough to fitwithin the profile of the fiber optic splitter module 14, as shown inFIG. 25, to preserve the density of the telecommunications assembly 10.

Main housing 94 includes an integrally formed flexible latch 52 (i.e.,cantilever arm) that is adapted to engage a portion of chassis 12 tohold module 14 within front opening 30 of chassis 12. Flexible latch 52also deflects to permit withdrawal of module 14 from chassis 12.

Still referring to FIGS. 20-30, latch 52 of module 14 includes a fingergrip tab 130, a front latching tab 132 and a rear latching tab 134.Front latching tab 132 and rear latching tab 134 define a recess 136therein between. Rear latching tab 134 includes a ramped face 138 thatcauses latch 52 to elastically deflect down when module 14 is beinginserted into chassis 12. Rear latching tab 134 also includes a squareface 140 that opposes a square face 142 of front latching tab 132.

Front lip 50 of bulkhead 48 at mounting location 38 of chassis 12 iscaptured in recess 136 between the two latching tabs 132, 134 to holdmodule 14 in place within chassis 12. During insertion, as front lip 50of bulkhead 48 clears ramped rear tab 134 and is captured in recess 136between the two latching tabs 132, 134, latch 52 flexes back upwardly.Recess 136 between the two tabs 132, 134 of latch 52 allows for acertain amount of horizontal float for splitter module 14 within chassis12, as will be discussed in further detail below.

The removal of module 14 from chassis 12 is performed by pressing latch52 downwardly to clear the square face 140 of rear tab 134 from lip 50and sliding module 14 away from chassis 12. Module 14 includes a fixedgrip tab 144 opposing and adjacent to flexible latch 52 to aid removalof module 14 from chassis 12. Fixed grip tab 144 is formed as a part offront wall 106 of module 14. Fixed grip tab 144 is preferably positionedon module 14 opposite latch 52 so that a user may apply opposing forceon latch 52 and fixed grip tab 144 to securely grasp module 14 andremove it from chassis 12. Fixed grip tab 144 is preferably positionedon module 14 close enough to latch 52 so that a user may be apply theforce with two adjacent fingers of the hand.

FIG. 22 shows an exploded view of fiber optic splitter module 14illustrating the internal components of module 14. Fiber optic splittermodule 14 is shown in FIG. 22 with adapter assembly 16 exploded frommodule 14.

Within interior 114 of main housing 94, splitter module 14 includes afirst radius limiter 146 adjacent curved portion 122 of rear wall 104 ofmain housing 94. Splitter module 14 includes a second radius limiter 148adjacent front wall 106 of housing 94 near cable exits 120. Connectors118 of splitter module 14 are slidably inserted into opposing slots 154formed in apertures 156 at the rear wall 104. Connectors 118 project outfrom rear wall 104 at inset portion 116 of rear wall 104. Outer housings150 of connectors 118 include transverse flanges 152 that are receivedwithin the opposing slots 154 formed in apertures 156 that accommodatethe connectors 118. Once slidably inserted, connectors 118 are capturedwithin housing 92 by cover 96.

Adjacent bottom wall 102 of main housing 94 within interior 114 is anoptical component 158 such as a fiber optic splitter or a fan-out.Optical component 158 is held against the interior of bottom wall 102 bya clamp 160 (i.e., bracket). Clamp 160 is mounted to a clamp mount 162defined on splitter module main housing 94 with fasteners (not shown).In the embodiment of the housing 94 shown in the FIGS., clamp mount 162includes two pairs of mounting holes 164, 166. Either the upper set ofholes 164 or the lower set of holes 166 are utilized depending upon thesize of the clamp that will be used to hold optical component 158against bottom wall 102. It should be noted that different opticalcomponents may have different thicknesses and may require the use ofdifferent sized clamps for holding the optical components in place. Incertain embodiments, two optical components that are stacked on top ofanother may be used, in which case, a smaller clamp would be used tohold the two optical components in place.

Optical component 158 is offset from the interior side of firsttransverse sidewall 98 by a set of cable management structures 168. Inthe embodiment of the module 14 illustrated, the set of cable managementstructures 168 are elongate structures 170 defining cable managementslits 172 therein between. When optical component 158 is held in place,cables can be routed through slits 172 between optical component 158 andthe interior of first transverse wall 98 (please see FIGS. 29 and 30).

Splitter module main housing 94 also includes integrally formed crimpholders 174 (e.g., slots) adjacent front wall 106 of housing 94underneath second radius limiter 148. Crimp elements 176 crimped to theends of cables that are split by optical component 158 are slidablyreceived into crimp holders 174 as shown in FIGS. 22 and 29. Crimpelements 176 define square flanges 175 between which is defined arecessed portion 177. The crimp holders 174 include complementarystructure to the crimp elements such that once the crimp elements 176are slidably inserted into the crimp holders 174, the crimp elements 176are prevented from moving in a longitudinal direction due to the flanges175. Once slidably inserted, crimp elements 176 are held in place bycover 96 that is mounted to splitter module main housing 94. In theembodiment shown, there are nine crimp holding slots 174, each one beingable to accommodate up to four crimp elements 176. Other numbers arepossible. Other complementary shapes between the crimp elements and thecrimp holding slots are also possible to provide a slidable fit and toprevent axial movement of the crimp elements once inserted therein thecrimp holders.

FIG. 29 shows fiber optic splitter module 14 without a cover 96 exposingthe interior features of fiber optic splitter module 14 includingrouting of a fiber optic cable within fiber optic splitter module 14.FIG. 30 illustrates a cross-sectional view taken along section line30-30 of FIG. 29.

As shown in FIG. 29, a first cable 178 extends from connector 118 towardoptical component 158, mounted within module housing 92. Opticalcomponent 158, as previously discussed, may be a splitter or a fan-outor another type of optical component. In the embodiment shown, opticalcomponent 158 is a fiber optic splitter that splits the signal of asingle strand to a plurality of secondary signals. In anotherembodiment, first cable 178 may be a multi-strand fiber cable with aplurality of strands of optical fiber and optical component may be afanout to separate the individual strands into each of a plurality ofsecond cables.

First cable 178, as it extends toward optical component 158, is insertedthrough slits 172 (see FIGS. 22, 29, and 30) located between opticalcomponent 158 and the inner side of first transverse sidewall 98 ofmodule housing 94 and looped around first radius limiter 146 and thenaround second radius limiter 148 before being received by opticalcomponent 158. Second cables 180 extend from optical component 158 andare looped again all the way around first radius limiter 146 beforeheading toward crimp holders 174. From crimp holders 174, cables (notshown) crimped to the other ends of the crimps 176 exit the modulethrough module exits 120.

An outside cable (not shown) may extend to rear end 70 of an adapter 64of adapter assembly 16 and be terminated by a connector (not shown inFIG. 29) that is optically connected to connector 118 of module 14through adapter 64 once module 14 is inserted within chassis 12. Itshould be noted that the routing of the fiber optic cables within module14 as shown in FIGS. 29 and 30 is only one example and other ways ofrouting the cables within the module are possible.

The embodiment of the fiber optic splitter module 14 shown in the FIGS.is configured such that it can accommodate reduced bend radius fiber. Areduced bend-radius fiber may have a bend radius of about 15 mm whereasa non-reduced bend-radius fiber may have a bend radius of about 30 mm.

Similar fiber optic splitter modules are described in commonly-ownedU.S. patent application Ser. Nos. 10/980,978 (filed Nov. 3, 2004,entitled FIBER OPTIC MODULE AND SYSTEM INCLUDING REAR CONNECTORS);11/138,063 (filed May 25, 2005, entitled FIBER OPTIC SPLITTER MODULE);11/138,889 (filed May 25, 2005, entitled FIBER OPTIC ADAPTER MODULE);and 11/215,837 (filed Aug. 29, 2005, entitled FIBER OPTIC SPLITTERMODULE WITH CONNECTOR ACCESS), the disclosures of which are incorporatedherein by reference.

The insertion of a splitter module 14 into chassis 12 is illustrated inFIGS. 31-35. Referring to FIGS. 31-35, insertion of fiber optic module12 into front opening 30 of chassis 12 begins the mating of module 14 tochassis 12 and to adapters 64 of adapter assembly 16. Top flanges engage44 top slots 40 and bottom flanges 46 engages bottom slots 42 of chassis12 as module 14 is inserted.

Still referring to FIGS. 31-35, chassis 12 includes a flexible shield182 in each mounting location 38. Shield 182 is adapted to preventprotection against accidental exposure to light. Shield 182 ispositioned in front end 68 of each adapter 64 of adapter assembly 16.Before a splitter module 14 is placed in an associated mounting location38, if a connectorized cable that is connected to an adapter 64 ofadapter assembly 16 is illuminated and transmitting light signals,shield 182 will prevent accidental exposure to these signals which mightdamage eyes or other sensitive organs, or nearby communicationsequipment. The insertion of splitter module 14 pushes shield 182 out ofthe way as illustrated in FIGS. 31-33.

Shield 182 is deflected by module 14 as module 14 is inserted throughfront opening 30 so that connectors 118 of module 14 can mate withadapters 64 of adapter assemblies 16. Shield 182 is preferably made of aresilient deformable material that will return to the position whenmodule 14 is withdrawn from mounting location 38.

For example, in FIG. 31, a fiber optic splitter module 14 is shownpartially inserted within chassis 12 prior to connectors 118 of splittermodule 14 having contacted shield 182 of chassis 12. In FIG. 32, fiberoptic splitter module 14 is shown in a position within chassis 12 withconnectors 118 of fiber optic splitter module 14 making initial contactwith shield 182 of chassis 12 to move shield 182 out of the way (a sidecross-sectional view is shown in FIG. 34). In FIG. 33, fiber opticsplitter module 14 is shown in a fully inserted position within chassis12, having moved shield 182 out of the way (a side cross-sectional viewis shown in FIG. 35).

Shield 182 is configured such that shield 182 does not engage theferrule 184 of connector 118 of splitter module 14 when connector 118contacts shield 182 to move it out of the way. Instead, outer connectorhousing 150 pushes shield 182 out of the way.

Shield 182 may be connected to chassis 12 by fasteners, or,alternatively, shield 182 may be formed integrally with chassis 12 ormounted by spot-welding or other fastening techniques.

As shield 182 is fully deflected, further insertion of module 14 bringsconnectors 118 into contact with adapters 64 and connectors 118 arereceived within front ends 68 of adapters 64. Latch 52 is deflectedinwardly as module 14 is inserted and then flexes back so that front lip50 of bulkhead 48 is captured in recess 136. Module 14 is now inposition to process and transmit signals from cable through first cable178, optical component 158 and second cable 180 within module interior114.

Referring to FIG. 35, as noted above, recess 136 between the two tabs132, 134 of latch 52 provides a certain amount of horizontal float forthe splitter module 14 within chassis 12. Front lip 50 of bulkhead 48 isallowed to move a distance of D as indicated in FIG. 35 before it makescontact with square face 140 of rear tab 134. Splitter module 14 isconfigured such that, when splitter module 14 is pulled away from front32 of chassis 12, distance D front lip 50 of bulkhead 48 travels beforecontacting square face 140 of rear tab 134 is less than the horizontalfloat (i.e., distance A) provided for adapter assembly 16, as discussedbefore.

In this manner, splitter module 14 provides a form of protection fromaccidentally disengaging connectors 118 of the module from adapterassemblies 16 at rear 28 of chassis 12. The size of recess 136 of module14 is configured such that the horizontal float of splitter module 14 isinterrupted before the adapter assembly 16 can be pulled far enoughtoward the front of chassis 12 to stop its horizontal movement andaccidentally disengage connectors 118 of module 14 from adapters 64.

FIGS. 36-45 illustrate a dust cap/test tool 190 configured for use withadapter assembly 16 of telecommunications assembly 10. Dust cap/testtool 190 includes a body 192 with a front end 194 and a rear end 196.Dust cap/test tool 190 includes a pair of connectors 118 protruding outfrom front end 194. As shown in FIG. 39, the pair of connectors 118 areslidably inserted into connector holders 193 of the body 192 of dustcap/test tool 190. Connector holders 193 include slots 195 for receivingflanges of outer housings of connectors 118, as in housing 94 ofsplitter module 14. Dust cap/test tool 190 also includes a pair of dustplugs 198 protruding out from rear end 196. Dust cap/test tool 190includes a top wall 200 and a bottom wall 202 and a first transverseside 204 and a second transverse side 206. The top and the bottom walls200, 202 include top and bottom flanges 208, 210, respectively, forslidable insertion into chassis 12 similar to fiber optic splittermodule 14. First transverse side 204 includes a radius limiter 212 forguiding cables terminated to connectors 118 of dust cap/test tool 190.There is a first grip 214 integrally formed with body 192 at front end194. There is a second grip 216 defined at the end of the radius limiter212 integrally formed with body 192 at rear end 196 of dust cap/testtool 190.

As shown in FIGS. 36 and 37, dust cap/test tool 190 is slidablyinsertable within chassis 12 and usable in two different ways. In FIG.36, dust cap/test tool 190 is shown being used as a test tool to testthe optical signals input into the adapter assemblies 16. Since adapterassemblies 16 are located at rear end 28 of chassis 12 and front ends 68of adapters 64 of adapter assemblies 16 are located in the interior ofchassis 12 at rear 28, it becomes difficult to access to the connectionsfor testing or other purposes. The pair of connectors 118 on front end194 of dust cap/test tool 190 are designed to be coupled to adapters 64of adapter assembly 16 when dust cap/test tool 190 is slidably insertedinto chassis 12. In this manner, the connections at adapter assemblies16 can be tested without having to uncouple adapter assemblies 16 fromchassis 12 and without having to reach into chassis 12.

As shown in FIG. 37, dust cap/test tool 190 can also be flipped around180° and used as a dust cap to seal the interior of adapters 64 fromcontaminants. If a splitter module 14 is not inserted within one of themounting locations 38 of chassis 12, dust cap/test tool 190 can act as aplaceholder and be slidably inserted within chassis 12. The dust plugs198 include recessed portions 199 for receiving protruding tabs 89 ofarms 91 of housing halves at the interior of an adapter 64. The recessedportions 199 help retain the dust plugs 198 within the adapters 64.

In FIG. 38, dust cap/test tool 190 is shown in combination with anadapter assembly 16 exploded off. In FIG. 39, dust cap/test tool 190 isshown with an adapter assembly 16 mounted thereon and shown with one ofthe testing connectors 118 of dust cap/test tool 190 exploded off dustcap/test tool 190.

FIGS. 46-52 illustrate a grip extension 218 adapted for use withconnectors 118 coupled to rear 70 of adapters 64 of adapter assembly 16.Grip extension 218 is designed to add length to the outer housing 150 ofa connector 118 to facilitate access to individual connectors 118 indense environments such as the telecommunications assembly 10. Gripextension is preferably first mounted over a cable before the cable isterminated to a connector 118. Once the connector 118 is terminated tothe cable, grip extension 218 is slid over the boot portion 220 of theconnector and mounted to the outer housing 150 of connector 118 as shownin FIG. 7.

Referring to FIGS. 46-52, grip extension 218 includes an elongate body222 with four cantilever arms extending from a front portion 224 of thebody 222. Two of the opposing cantilever arms 226, 228 includeprotruding tabs 230 for engagement with the gripping surface 232 ofouter housing 150 of connectors 118. Two of the other opposingcantilever arms 234, 236 include slits 238 for engaging the flanges 240defined on connector outer housings 150. With the four cantilever arms226, 228, 234, 236, the grip extensions 218 are snap-fit onto connectorhousings 150. The rear portion 242 of the grip extension body 222includes a top side 244, an open bottom side 246 and two transversesides 248, 250 that taper in going in a direction from the front 224 tothe back 242. Top and bottom sides 244, 246 include grip structures 252to facilitate pulling on grip extensions 218 to remove connectors 118.

The above specification, examples and data provide a completedescription of the manufacture and use of the invention. Since manyembodiments of the invention can be made without departing from thespirit and scope of the invention, the invention resides in the claimshereinafter appended.

1. A telecommunications assembly, comprising: a chassis comprising atop, a bottom, a front opening, a rear opening, and first and secondtransverse sides extending between the front and rear openings, thechassis defining a plurality of mounting locations; a fiber opticadapter mounted to the chassis at each of the mounting locations, eachfiber optic adapter including a front end directed toward the frontopening of the chassis and a rear end directed toward the rear openingof the chassis, each front end and each rear end configured to receive afiber optic connector; and at least one dust cap tool mounted to thechassis at one of the mounting locations, the dust cap tool configuredto be inserted into the chassis through the front opening, wherein thedust cap tool includes a dust plug that is configured to be insertedinto the front end of the fiber optic adapter at the associated mountinglocation when the dust cap tool is inserted into the chassis through thefront opening, wherein the dust cap tool further defines a bodyincluding a front end and a rear end, the body including a finger gripadjacent the front end and a finger grip adjacent the rear end.
 2. Atelecommunications assembly according to claim 1, further comprising adust cap tool mounted at each of the mounting locations of the chassis.3. A telecommunications assembly according to claim 1, wherein the dustcap tool further includes at least one fiber optic connector holder forholding a fiber optic connector that can mate with the first end of thefiber optic adapter mounted within the chassis, wherein the fiber opticconnector of the dust cap tool can mate with the fiber optic adapter ofthe chassis by inserting the dust cap tool into the chassis in adifferent orientation.
 4. A telecommunications assembly according toclaim 3, wherein the dust cap tool includes the body including the frontend, the rear end, a top side, a bottom side, and first and secondtransverse sides, the body defining a longitudinal guide flange adjacentthe top side and a longitudinal guide flange adjacent the bottom side,the at least one fiber optic connector holder provided adjacent thefront end and the dust plug provided adjacent the rear end, wherein thedust cap tool can be slidably inserted into the chassis in one of twodifferent orientations, wherein in a first orientation, the rear end ofthe body is inserted into the chassis first, and wherein in a secondorientation, the front end of the body is inserted into the chassisfirst.
 5. A telecommunications assembly according to claim 4, whereinthe body defines a cable management structure extending from theconnector holder adjacent the front end toward the dust plug adjacentthe rear end.
 6. A telecommunications assembly according to claim 4,wherein the body is generally rectangular and the connector holder andthe dust plug being positioned in diagonal corners of the rectangularbody.
 7. A telecommunications assembly according to claim 3, wherein theconnector holder accommodates two fiber optic connectors and wherein thedust cap tool includes two dust plugs.
 8. A telecommunications assemblyaccording to claim 3, wherein the fiber optic connector is slidablyinsertable and removable from the connector holder of the dust cap tool.9. A telecommunications assembly according to claim 4, wherein the dustplug is integrally molded with the body of the dust cap tool.
 10. Atelecommunications assembly according to claim 1, further comprising afiber optic module including fiber optic equipment mounted theretoinserted into one of the mounting locations of the chassis, the fiberoptic module insertable into the chassis through the front opening. 11.A telecommunications assembly according to claim 10, wherein the fiberoptic module includes a fiber optic connector at a rear end of themodule that is configured to mate with the fiber optic adapter of thechassis when the fiber optic module is inserted into the chassis, thefiber optic module including a fiber optic splitter that is configuredto be optically connected to a signal coming into the fiber optic modulethrough the fiber optic connector mated to the fiber optic adapter ofthe chassis.
 12. A telecommunications assembly according to claim 1,wherein each fiber optic adapter is removably mounted into the chassisat each of the mounting locations.
 13. A telecommunications assemblyaccording to claim 12, wherein each fiber optic adapter is removablymounted into the chassis through the rear opening.